1. Heat pumps are used for ______.
a) cooking and cleaning (Kochen und Putzen)
b) heating and cooling (Heizen und Kühlen)

2. They work by transferring ______ from one place to another.
a) air (Luft)
b) heat (Wärme)

3. Heat pumps are very ______.
a) noisy (laut)
b) energy-efficient (energieeffizient)

4. They use electricity to ______ heat, not create it.
a) move (bewegen)
b) create (erzeugen)

5. You can use heat pumps for ______.
a) homes and offices (Wohnhäuser und Büros)
b) factories only (nur Fabriken)

6. Heat pumps work well in ______.
a) summer only (nur im Sommer)
b) all seasons (alle Jahreszeiten)

7. In summer, they ______ your space.
a) heat (heizen)
b) cool (kühlen)

8. In winter, they provide ______.
a) warmth (Wärme)
b) ventilation (Belüftung)

9. Heat pumps are ______ than many traditional systems.
a) noisier (lauter)
b) quieter (leiser)

10. They are good for the ______.
a) environment (Umwelt)
b) economy (Wirtschaft)

11. Heat pumps extract heat from the ______.
a) air, ground, or water (Luft, Erde oder Wasser)
b) fire and smoke (Feuer und Rauch)

12. They use a ______ to transfer heat effectively.
a) refrigerant (Kältemittel)
b) thermostat (Thermostat)

13. These systems work even in ______ outdoor temperatures.
a) warm (warme)
b) cold (kalte)

14. Installing a heat pump can reduce your ______.
a) energy bills (Energiekosten)
b) shopping costs (Einkaufskosten)

15. Heat pumps help lower ______ gas emissions.
a) greenhouse (Treibhausgas-)
b) nitrogen (Stickstoff-)

16. They are often combined with ______ energy sources.
a) fossil (fossile)
b) renewable (erneuerbare)

17. There are different types of heat pumps, like ______.
a) air-source and ground-source (Luft- und Erdwärme-)
b) water-source and fire-source (Wasser- und Feuer-)

18. Air-source heat pumps are the ______ type.
a) most common (häufigste)
b) rarest (seltenste)

19. Ground-source heat pumps use ______.
a) underground heat (Erdwärme)
b) surface heat (Oberflächenwärme)

20. Water-source heat pumps use ______ for heat transfer.
a) water bodies (Gewässer)
b) fire pits (Feuerstellen)